Initial Dinghy Stability

Thank you @rodrimonti , I can share them with you later for confirmation, its too early for now.
Regards

 

Your full sized boat at 3.8 meters is a small one. Maximum expected displacement might be something like 300 kilos, more or less.

Your model at 1/10 means that its water test can have the model displace only 0.3 kilos. In that case the construction of the model will become problematic because it must have its component parts, sides, bottom, deck, etc be near the same proportion, and scale weight as the full sized components.

You can use the reciprocal of the scale raised to the third power to arrive at scale weight for the various parts of the model. Thus your model can weigh only one thousandth of the displaced weight of the full sized boat. ...............10 x 10 x 10 =1000. It is easy to see that a model can be more representative if it is built to a larger scale; for example; one fifth scale.....5 x 5 x 5 =125 and the model can then weigh 300/125 = 2.4 kilos. The weight of the model components then becomes less critical but remains important.

 

Dear @messabout , you are right, I agree.
3D model was not successful due to shell thickness. Contribution of all components should be involved with same proportions to model, unfortunately due to limits of 3D printing thickness can not be reduced to desired level (0.8mm), solution may be to increase model size and simulate all the weights proportionally (or sum of all components of coordinates x/y).
Regards